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PC Power Box with E-fuse


Tanınmış Üye
This little circuit will help you to remove all surplus small ac mains adaptors from your desktop. The circuit is nothing, but a smart dc power box directly powered by the smps of your desktop personal computer. Regulated, clean and protected +12VDC is available at the output of this unit. In addition, a USB power port is provided to re-charge portable devices including cellphones and music players, etc.

How does the pc power box works
All you need is to open your system box and connect an unused 4-pin drive power connector from the system smps to this circuit. +12V (Yellow wire) from the smps is processed by a resettable electronic fuse built around components T1, T2 and T3 and feed to the output terminal. Similarly the +12V is down converted to stable +5V by fixed 3 pin regulator IC1.

As a result, +12V (500 -750mA max, based on the electrical characteristics of T2 used) and +5V (1A max) DC supplies are available for external use, without affecting the normal pc functions. Switch S1 is the power on/off cum reset switch. Resistor R3 sets the maximum allowable output current rate and T1 disables the output power switch T3, when output load current exceeds the set value.

Smart dc power box circuit schematic

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